ipv6: make ECMP route replacement less greedy

[firefly-linux-kernel-4.4.55.git] / net / ipv6 / ip6mr.c

diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index ad19136086dd5e1ae4e362e3da0f0267fc755b02..d9843e5a667fe76c62eea32cfeae892b1a2663ef 100644 (file)
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -118,7 +118,7 @@ static void mr6_netlink_event(struct mr6_table *mrt, struct mfc6_cache *mfc,
                              int cmd);
 static int ip6mr_rtm_dumproute(struct sk_buff *skb,
                               struct netlink_callback *cb);
-static void mroute_clean_tables(struct mr6_table *mrt);
+static void mroute_clean_tables(struct mr6_table *mrt, bool all);
 static void ipmr_expire_process(unsigned long arg);
 
 #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
@@ -334,7 +334,7 @@ static struct mr6_table *ip6mr_new_table(struct net *net, u32 id)
 static void ip6mr_free_table(struct mr6_table *mrt)
 {
        del_timer_sync(&mrt->ipmr_expire_timer);
-       mroute_clean_tables(mrt);
+       mroute_clean_tables(mrt, true);
        kfree(mrt);
 }
 
@@ -765,10 +765,6 @@ static struct net_device *ip6mr_reg_vif(struct net *net, struct mr6_table *mrt)
        return dev;
 
 failure:
-       /* allow the register to be completed before unregistering. */
-       rtnl_unlock();
-       rtnl_lock();
-
        unregister_netdevice(dev);
        return NULL;
 }
@@ -1078,6 +1074,7 @@ static struct mfc6_cache *ip6mr_cache_alloc(void)
        struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
        if (!c)
                return NULL;
+       c->mfc_un.res.last_assert = jiffies - MFC_ASSERT_THRESH - 1;
        c->mfc_un.res.minvif = MAXMIFS;
        return c;
 }
@@ -1542,7 +1539,7 @@ static int ip6mr_mfc_add(struct net *net, struct mr6_table *mrt,
  *     Close the multicast socket, and clear the vif tables etc
  */
 
-static void mroute_clean_tables(struct mr6_table *mrt)
+static void mroute_clean_tables(struct mr6_table *mrt, bool all)
 {
        int i;
        LIST_HEAD(list);
@@ -1552,8 +1549,9 @@ static void mroute_clean_tables(struct mr6_table *mrt)
         *      Shut down all active vif entries
         */
        for (i = 0; i < mrt->maxvif; i++) {
-               if (!(mrt->vif6_table[i].flags & VIFF_STATIC))
-                       mif6_delete(mrt, i, &list);
+               if (!all && (mrt->vif6_table[i].flags & VIFF_STATIC))
+                       continue;
+               mif6_delete(mrt, i, &list);
        }
        unregister_netdevice_many(&list);
 
@@ -1562,7 +1560,7 @@ static void mroute_clean_tables(struct mr6_table *mrt)
         */
        for (i = 0; i < MFC6_LINES; i++) {
                list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[i], list) {
-                       if (c->mfc_flags & MFC_STATIC)
+                       if (!all && (c->mfc_flags & MFC_STATIC))
                                continue;
                        write_lock_bh(&mrt_lock);
                        list_del(&c->list);
@@ -1625,7 +1623,7 @@ int ip6mr_sk_done(struct sock *sk)
                                                     net->ipv6.devconf_all);
                        write_unlock_bh(&mrt_lock);
 
-                       mroute_clean_tables(mrt);
+                       mroute_clean_tables(mrt, false);
                        err = 0;
                        break;
                }
@@ -2278,8 +2276,8 @@ static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
        return 1;
 }
 
-int ip6mr_get_route(struct net *net,
-                   struct sk_buff *skb, struct rtmsg *rtm, int nowait)
+int ip6mr_get_route(struct net *net, struct sk_buff *skb, struct rtmsg *rtm,
+                   int nowait, u32 portid)
 {
        int err;
        struct mr6_table *mrt;
@@ -2324,6 +2322,7 @@ int ip6mr_get_route(struct net *net,
                        return -ENOMEM;
                }
 
+               NETLINK_CB(skb2).portid = portid;
                skb_reset_transport_header(skb2);
 
                skb_put(skb2, sizeof(struct ipv6hdr));